The following is a list of most watched United States television broadcasts of 1989 (single-network only) according to Nielsen.
| Week of | Program | Network | Viewers (millions) | Ref. |
|---|---|---|---|---|
| January 2 | The Cosby Show | NBC | 46.1 | [1] |
| January 9 | 48.4 | [2] | ||
| January 16 | Super Bowl XXIII | 81.6 | [3] | |
| January 23 | The Cosby Show | 44.1 | [4] | |
| January 30 | 45.7 | [5] | ||
| February 6 | 44.2 | [6] | ||
| February 13 | 43.8 | [7] | ||
| February 20 | 45.0 | [8] | ||
| February 27 | 42.3 | [9] | ||
| March 6 | Roseanne | ABC | 44.3 | [10] |
| March 13 | 41.2 | [11] | ||
| March 20 | 41.2 | [12] | ||
| March 27 | 61st Academy Awards | 42.6 | [13] | |
| April 3 | Roseanne | 36.2 | [14] | |
| April 10 | 39.2 | [15] | ||
| April 17 | 41.8 | [16] | ||
| April 24 | 33.2 | [17] | ||
| May 1 | 35.8 | [18] | ||
| May 8 | Family Ties | NBC | 36.3 | [19] |
| May 15 | Everybody's Baby: The Rescue of Jessica McClure | ABC | 37.6 | [20] |
| May 22 | I Know My First Name Is Steven , Part 2 | NBC | 40.3 | [21] |
| May 29 | Roseanne | ABC | 31.8 | [22] |
| June 5 | 28.5 | [23] | ||
| June 12 | 29.0 | [24] | ||
| June 19 | 27.6 | [25] | ||
| June 26 | 26.9 | [26] | ||
| July 3 | Cheers | NBC | 24.1 | [27] |
| July 10 | Roseanne | ABC | 26.3 | [28] |
| July 17 | 26.2 | [29] | ||
| July 24 | 25.5 | [30] | ||
| July 31 | 28.5 | [31] | ||
| August 7 | 28.2 | [32] | ||
| August 14 | 27.9 | [33] | ||
| August 21 | 30.4 | [34] | ||
| August 28 | 30.1 | [35] | ||
| September 4 | Cheers | NBC | 26.5 | [36] |
| September 11 | Roseanne | ABC | 39.4 | [37] |
| September 18 | The Cosby Show | NBC | 39.3 | [38] |
| September 25 | Roseanne | ABC | 41.7 | [39] |
| October 2 | 43.5 | [40] | ||
| October 9 | 40.8 | [41] | ||
| October 16 | The Cosby Show | NBC | 38.0 | [42] |
| October 23 | Roseanne | ABC | 38.6 | [43] |
| October 30 | The Cosby Show | NBC | 40.2 | [44] |
| November 6 | 42.3 | [45] | ||
| November 13 | 41.8 | [46] | ||
| November 20 | Roseanne | ABC | 38.8 | [47] |
| November 27 | The Cosby Show | NBC | 42.8 | [48] |
| December 4 | 37.4 | [49] | ||
| December 11 | Roseanne | ABC | 37.3 | [50] |
| December 18 | 33.8 | [51] | ||
| December 25 | AFC Wild Card Game | NBC | 36.1 | [52] |